Added ClientCount for PerformenceMonitor

Add a marker to help distinguish EP from other SV Executables
Fixed a "Failed to copy object. Source is null." introduced by last update
Uses dynamic ThreadCount instead of fixed 16
Re-Removed most PF support
Re-Parallelzed Level update and Character Update(a conflict warning will be issued

Barotrauma/BarotraumaServer/ServerSource/PerformenceMonitor.cs

@@ -37,6 +37,10 @@ namespace Barotrauma
         {
             get { return PhysicsBody.List.Count; }
         }
+        public int ConnectClients
+        {
+            get { return Client.ClientList.Count; }
+        }
 
         public double RealTickRate
         {
@@ -160,6 +164,7 @@ namespace Barotrauma
             return $"Server Performence Info \n" +
                    $"Item Count: {ItemCount}\n" +
                    $"Character Count: {CharacterCount}\n" +
+                   $"Clients Count {ConnectClients}\n " +
                    $"PhysicsBody Count: {PhysicsBodyCount}\n" +
                    $"Tick Rate: {RealTickRate}\n" +
                    $"Min Tick Rate: {TickRateLow}\n" +

Barotrauma/BarotraumaServer/ServerSource/Program.cs

@@ -64,7 +64,7 @@ namespace Barotrauma
                 GameMain.ShouldRun = false;
             };
 #endif
-            Console.WriteLine("Barotrauma Dedicated Server " + GameMain.Version +
+            Console.WriteLine("Barotrauma Dedicated Server(EP) " + GameMain.Version +
                 " (" + AssemblyInfo.BuildString + ", branch " + AssemblyInfo.GitBranch + ", revision " + AssemblyInfo.GitRevision + ")");
             if (Console.IsOutputRedirected)
             {